<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <script src="./vue.global.js"></script>
  <title>Document</title>
</head>
<body>
  <div id="root">
    {{title}} {{num}}
    <!-- <my-title @my-event="handleMyEvent"></my-title> -->
    <my-title v-model:num="num"></my-title>
  </div>
  <script>
    const { createApp } = window.Vue

    const MyTitle = {
      emits: {
        'my-event'(args) {
          if (args === 100) {
            return true
          } else {
            return false
          }
        },
        'update:num'() {
          return true
        }
      },

      template: `
        <div>
          <button @click="handleClick">click</button>  
        </div>
      `,

      methods: {
        handleClick() {
          // this.$emit('my-event', 100)
          this.$emit('update:num', 900)
        }
      },
    }
    
    const app = createApp({
      components: {
        MyTitle
      },

      data() {
        return {
          title: 'hello',
          num: 90
        }
      },

      methods: {
        handleMyEvent(num) {
          this.num = num
        }
      },
    })
    let vm = app.mount('#root')
  </script>
</body>
</html>